Just FYI,
DJIA = 30 stocks.
S&P 500 = 500 stocks (largest 500, by market cap).
NASDAQ is hundreds of stocks.

Other trivia:
SPY & QQQ use market cap to compute their values, but DJIA index computed with a complex formula invented years ago before market cap became the standard. The 30 stocks have changed over the years. Only 2 or 3 are original members of the index.

And now, back to chipping ...